CN109099718B - Rotary kiln waste heat recovery system - Google Patents
Rotary kiln waste heat recovery system Download PDFInfo
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- CN109099718B CN109099718B CN201811243007.0A CN201811243007A CN109099718B CN 109099718 B CN109099718 B CN 109099718B CN 201811243007 A CN201811243007 A CN 201811243007A CN 109099718 B CN109099718 B CN 109099718B
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- kiln
- heat exchanger
- rotary kiln
- heat
- air
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- 239000002918 waste heat Substances 0.000 title claims abstract description 35
- 238000011084 recovery Methods 0.000 title claims abstract description 30
- 239000007789 gas Substances 0.000 claims abstract description 52
- 239000002912 waste gas Substances 0.000 claims abstract description 30
- 239000012530 fluid Substances 0.000 claims abstract description 27
- 238000001035 drying Methods 0.000 claims abstract description 23
- 238000007599 discharging Methods 0.000 claims abstract description 10
- 239000000428 dust Substances 0.000 claims description 27
- 230000005855 radiation Effects 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 6
- 238000005265 energy consumption Methods 0.000 abstract description 6
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000004064 recycling Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 9
- 238000001816 cooling Methods 0.000 description 8
- 238000002485 combustion reaction Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 238000001354 calcination Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention provides a rotary kiln waste heat recovery system, which comprises a rotary kiln, a heat exchanger and a heat exchange tube; the rotary kiln is provided with a kiln head and a kiln tail, the kiln tail is provided with an air outlet for discharging waste gas, and the kiln head is provided with a clinker outlet and a combustion-supporting gas inlet; the hot fluid channel of the heat exchanger is communicated with the air outlet of the kiln tail, and the cold fluid outlet of the heat exchanger is provided with a drying air pipeline which is used for being connected with the air inlet of the drying kiln. The heat exchange tube is provided with a feed inlet, an air inlet and an air outlet, the feed inlet of the heat exchange tube is connected with a clinker outlet, and the air outlet of the heat exchange tube is communicated with a combustion-supporting gas inlet through a hot air pipeline. The waste heat recovery system of the rotary kiln disclosed by the invention utilizes the heat exchange pipe to recover the sensible heat of the kiln head high-temperature clinker, so that the working energy consumption of the rotary kiln is reduced; meanwhile, the heat exchanger is used for recycling the waste heat of the high-temperature waste gas at the tail of the kiln, so that the energy consumption of the drying kiln is reduced, and the effects of heat energy recycling, energy saving and environmental protection are realized.
Description
Technical Field
The invention relates to the technical field of mineral smelting, in particular to a waste heat recovery system of a rotary kiln.
Background
The rotary kiln can calcine active lime and other materials, and has wide application in cement, metallurgy and other industries. Rotary kilns generally have a cylindrical kiln body, two ends of the kiln body are respectively a kiln head and a kiln tail, and the height of the kiln tail is higher than that of the kiln head.
In the working process, raw materials enter the kiln body from the kiln tail, the materials move towards the kiln head in the kiln body, and combustion-supporting gas continuously enters the kiln body from the kiln head to provide oxygen for the combustion of the materials. After the calcination is completed, the clinker is discharged from the kiln head, and the combustion-supporting gas is converted into high-temperature waste gas after combustion and is discharged from the kiln tail. In the process of calcining the materials by the rotary kiln, a great amount of radiant heat can be emitted to the outside by the kiln head, and high-temperature waste gas can be discharged to the outside by the kiln tail, so that the greenhouse effect is increased, and the energy waste is caused.
In summary, how to recover the heat generated by the operation of the rotary kiln, so as to save energy, is a problem to be solved by those skilled in the art.
Disclosure of Invention
Therefore, the invention aims to provide a rotary kiln waste heat recovery system which can recycle heat generated during the operation of a rotary kiln and reduce the consumption of energy.
In order to achieve the above object, the present invention provides the following technical solutions:
a rotary kiln waste heat recovery system comprising:
the rotary kiln comprises a kiln head and a kiln tail, wherein the kiln tail is provided with an air outlet for discharging waste gas, and the kiln head is provided with a clinker outlet and a combustion-supporting gas inlet;
the hot fluid channel of the heat exchanger is communicated with the air outlet of the kiln tail, and the cold fluid outlet of the heat exchanger is provided with a drying air pipeline connected with the air inlet of the drying kiln.
The heat exchange tube is provided with a feed inlet, an air inlet and an air outlet, the feed inlet of the heat exchange tube is connected with the clinker outlet, and the air outlet of the heat exchange tube is communicated with the combustion-supporting gas inlet through a hot air pipeline.
Preferably, a high-temperature dust remover is arranged between the air outlet of the kiln tail and the hot fluid inlet of the heat exchanger.
Preferably, the high-temperature dust remover is a metal film high-temperature dust remover; and/or the heat exchanger is a plate type air preheater.
Preferably, a heat radiation collecting box for wrapping the kiln head is arranged outside the rotary kiln, and the heat radiation collecting box is provided with an air outlet; and a cold fluid inlet of the heat exchanger is connected with an air outlet of the heat radiation collecting box through an induced air pipeline.
Preferably, a first induced draft fan is arranged in the air passage of the induced draft pipeline; and/or a second induced draft fan and a chimney for discharging gas are sequentially arranged in the gas channel of the hot fluid outlet of the heat exchanger.
Preferably, the heat exchange tube comprises a horizontal section heat exchanger and a vertical section heat exchanger, one end of the vertical section heat exchanger is connected with the kiln head, the other end of the vertical section heat exchanger is connected with the end part of the horizontal section heat exchanger, and one end, far away from the vertical section heat exchanger, of the horizontal section heat exchanger is provided with a blower.
Preferably, the horizontal section heat exchanger is a rotatable tubular structure, and the inner side wall of the tubular structure is provided with spiral blades for enabling materials to uniformly overturn.
Preferably, the feed inlet and the air outlet of the heat exchange tube are both arranged at the same end of the vertical section heat exchanger, and the discharge outlet and the air inlet of the heat exchange tube are both arranged at the same end of the horizontal section heat exchanger.
Preferably, a high-temperature induced draft fan is arranged in the gas channel of the hot air pipeline.
Preferably, a cyclone dust collector is arranged between the heat exchange tube and the high-temperature induced draft fan.
The rotary kiln waste heat recovery system provided by the invention comprises a rotary kiln, a heat exchanger and a heat exchange tube; the rotary kiln is provided with a kiln head and a kiln tail; the hot fluid channel of the heat exchanger is communicated with the air outlet of the kiln tail, and the cold fluid outlet is provided with a dry air pipeline; the feed inlet of the heat exchange tube is connected with the clinker outlet of the kiln head, and the air outlet of the heat exchange tube is communicated with the combustion-supporting gas inlet.
In the working process, the temperature of the waste gas discharged from the kiln tail is higher, the waste gas is used as the hot fluid of the heat exchanger to exchange heat in the heat exchanger, and the gas medium can enter the drying kiln through the drying air pipeline after absorbing heat, so that the energy consumption of the drying kiln is reduced, and the recovery of the heat of the waste gas is realized. Meanwhile, air and high-temperature clinker at the tail of the kiln are subjected to heat exchange in a heat exchange tube, and the air can be used as combustion-supporting gas of the rotary kiln after absorbing heat, so that the energy required by the rotary kiln for heating materials is reduced.
The rotary kiln waste heat recovery system provided by the application recovers the sensible heat of kiln head clinker and the heat energy of kiln tail waste gas waste heat, reduces the energy consumption of the rotary kiln and the drying kiln, and achieves the effects of waste heat recovery, energy conservation and environmental protection.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a rotary kiln waste heat recovery system provided by the invention.
The reference numerals in fig. 1 are:
the heat radiation collecting box 1, the first induced draft fan 2, the rotary kiln 3, the induced draft pipe 4, the smoke pipe 5, the high-temperature dust remover 6, the dry air pipe 7, the heat exchanger 8, the second induced draft fan 9, the chimney 10, the blanking pipe 11, the blower 12, the horizontal section heat exchanger 13, the vertical section heat exchanger 14, the cyclone dust remover 15, the high-temperature induced draft fan 16 and the hot air pipe 17.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a rotary kiln waste heat recovery system which can recycle heat generated during the operation of a rotary kiln and effectively solve the problem of poor waste heat recycling effect of the rotary kiln.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a rotary kiln waste heat recovery system provided by the present invention, wherein arrows in the diagram indicate a flow direction of a medium.
The invention provides a rotary kiln waste heat recovery system which comprises a rotary kiln 3, a heat exchanger 8 and a heat exchange tube; the rotary kiln 3 is provided with a kiln head and a kiln tail, the kiln tail is provided with an air outlet for discharging waste gas, and the kiln head is provided with a clinker outlet and a combustion-supporting gas inlet; the hot fluid channel of the heat exchanger 8 is communicated with the air outlet of the kiln tail, and the cold fluid outlet of the heat exchanger 8 is provided with a drying air pipeline 7 which is used for being connected with the air inlet of the drying kiln. The heat exchange tube is provided with a feed inlet, a discharge outlet, an air inlet and an air outlet, the feed inlet of the heat exchange tube is connected with a clinker outlet, and the air outlet of the heat exchange tube is communicated with a combustion-supporting gas inlet through a hot air pipeline 17.
Specifically, the rotary kiln 3 is capable of containing the material and combustion-supporting gas required for combustion, while the rotary kiln 3 is equipped with a heating assembly capable of calcining the material. The kiln heads and the kiln tails are positioned at two ends of the rotary kiln 3, and the kiln heads are used for conveying combustion-supporting gas into the rotary kiln 3 and discharging calcined clinker at the same time, and are provided with a combustion-supporting gas inlet and a clinker outlet; the kiln tail is used for conveying raw materials to be calcined into the rotary kiln 3 and discharging waste gas generated in the combustion process, and is provided with a raw material inlet and a gas outlet for discharging the waste gas.
The clinker discharged from the kiln head has higher temperature, and the heat exchange pipe is connected with the clinker outlet of the kiln head in a sealing way through the blanking pipe 11, so that the clinker enters the heat exchange pipe and exchanges heat with air to recover the heat energy of the clinker. In the working process, air and high-temperature clinker are subjected to heat exchange and then are conveyed to a combustion-supporting gas inlet of a kiln head through a hot air pipeline 17 to be used as combustion-supporting gas of the rotary kiln 3, so that the heat efficiency of the rotary kiln 3 is improved, and the energy consumption of the rotary kiln 3 is reduced; meanwhile, the heat exchange tube can also cool down the high-temperature clinker, so that the energy source required for cooling the clinker is further saved.
The heat exchanger 8 is a heat exchange device taking gas as a medium, specifically, the heat exchanger 8 takes the gas medium as cold fluid and kiln tail waste gas as hot fluid to perform a heat exchange process, and the gas medium absorbs the heat energy of the waste gas, then the temperature rises, and the gas medium enters the drying air pipeline 7 through a hot fluid outlet of the heat exchanger 8. The heat exchanger 8 may be a plate air preheater or other type of heat exchanger, and the specific structure thereof refers to the prior art.
The drying air pipeline 7 is in sealing connection with a cold fluid outlet of the heat exchanger 8 and is used for introducing gas absorbing waste gas heat energy into the drying kiln as drying air.
The rotary kiln waste heat recovery system is provided with the heat exchange tube and the heat exchanger 8, and in the working process, the heat exchanger 8 utilizes a gas medium to recover heat energy of waste gas at the tail of the kiln, and the gas medium after absorbing heat is used as drying air to be introduced into the drying kiln for use, so that energy consumed by the drying kiln when heating and drying the gas is reduced; meanwhile, the heat exchange tube can recycle heat energy of high-temperature clinker discharged from the kiln head, and air after absorbing heat is used as combustion-supporting gas to be introduced into a combustion-supporting gas inlet of the kiln head, so that energy required by the rotary kiln 3 for heating the combustion-supporting gas is reduced. Therefore, the rotary kiln waste heat recovery system provided by the application recovers the heat energy of the kiln head high-temperature clinker and the kiln tail high-temperature waste gas, and achieves the effects of waste heat recovery, energy conservation and environmental protection.
Further, considering that a great amount of impurities are mixed in the exhaust gas at the kiln tail, the abrasion of the heat exchanger 8 may be caused, so in this embodiment, the high-temperature dust remover 6 is arranged between the gas outlet at the kiln tail and the hot fluid inlet of the heat exchanger 8. The high-temperature dust remover 6 is used for removing dust from high-temperature waste gas and can be connected with a waste gas outlet of the kiln tail through a smoke pipe 5. The high-temperature dust remover 6 can purify the waste gas to enable the waste gas to reach the emission standard; and at the same time the service life of the heat exchanger 8 can be prolonged.
Optionally, because the temperature of the exhaust gas discharged from the kiln tail is higher and the exhaust gas generally contains chlorine, the high-temperature dust remover 6 in the embodiment preferably adopts a metal film high-temperature dust remover, so that the stable operation of the equipment in a high-temperature environment is ensured on one hand; on the other hand, the dust and chlorine removal can be carried out on the waste gas, the corrosion of equipment is avoided, and the environmental pollution caused by the discharged waste gas is reduced. It will be appreciated that other types of dust removal devices may be used for the high temperature dust collector 6, and reference is made to the prior art for specific construction.
It should be noted that, when the kiln tail waste gas is treated in the prior art, the waste gas generally enters the cyclone dust collector through the cooling flue, and then is discharged outwards after being treated by the wet dust collector; in this embodiment, the dust removal treatment is performed at the high temperature section of the exhaust gas flow channel, the waste heat of the exhaust gas is recovered by the heat exchanger 8, and finally the cooling and discharging are performed. The rotary kiln waste heat recovery system provided by the embodiment can effectively recover waste heat of waste gas and prolong the service life of equipment.
Furthermore, in order to enhance the waste heat recovery effect, on the basis of any one of the embodiments, a heat radiation collecting box 1 wrapping the kiln head is arranged outside the rotary kiln 3, and the heat radiation collecting box 1 is provided with an air outlet; the cold fluid inlet of the heat exchanger 8 is connected with the air outlet of the heat radiation collecting box 1 through an induced air pipeline 4.
Specifically, the heat radiation collecting box 1 is a hot gas collecting device and is arranged on the outer sides of the kiln head and the rotary kiln 3. The heat radiation collecting box 1 can be square or other box body structures made of carbon steel materials, and the side wall of the box body structure is provided with an opening structure. In the actual installation process, the opening structure of the heat radiation collecting box 1 can be attached to the outer side wall of the rotary kiln 3, or can be sleeved on the periphery of the rotary kiln 3.
The kiln head and the kiln body of the rotary kiln 3 radiate radiant heat to the outside, and air inside the heat radiation collection box 1 absorbs the heat radiation and raises a certain temperature. It will be appreciated that since the gas absorbing the thermal radiation needs to continuously enter the heat exchanger 8 for heat exchange, the thermal radiation collecting box 1 needs to be provided with a vent hole for ventilation of the gas.
In the working process, the air in the heat radiation collecting box 1 absorbs radiation heat and heats up for the first time, then enters the heat exchanger 8 as cold fluid to absorb the heat energy of high-temperature waste gas for heating up for the second time, and finally is introduced into the drying kiln through the drying air pipeline 7. The gas medium recovers the waste heat of the kiln tail waste gas and the heat radiation of the kiln head and the kiln body.
Optionally, in order to facilitate introducing air inside the heat radiation collecting tank 1 into the heat exchanger 8, the air channel of the induced air duct 4 is provided with a first induced draft fan 2, i.e. the first induced draft fan 2 is arranged between the heat radiation collecting tank 1 and the cold fluid inlet of the heat exchanger 8, so as to improve heat exchange efficiency.
Optionally, in order to facilitate exhaust gas emission, a gas channel of the hot fluid outlet of the heat exchanger 8 is sequentially provided with a second induced draft fan 9 and a chimney 10. Namely, the second induced draft fan 9 is in sealing connection with the hot fluid outlet of the heat exchanger 8 through a corresponding pipeline, and conveys the waste gas to the chimney 10 for discharge.
Optionally, in an embodiment provided herein, the heat exchange tube includes a horizontal section heat exchanger 13 and a vertical section heat exchanger 14, one end of the vertical section heat exchanger 14 is connected with the kiln head, the other end is connected with an end of the horizontal section heat exchanger 13, and one end of the horizontal section heat exchanger 13 far away from the vertical section heat exchanger 14 is provided with the blower 12. Specifically, the horizontal heat exchanger 13 and the vertical heat exchanger 14 are devices for directly exchanging heat between materials and air, and are distributed in an L shape. In the working process, low-temperature air sequentially passes through the horizontal section heat exchanger 13 and the vertical section heat exchanger 14 under the action of the blower 12 and enters the rotary kiln 3 for combustion supporting.
In the prior art, a water cooling mode is generally adopted to cool materials after clinker is obtained, a large amount of water mist can be generated during operation, the production environment is affected, and the waste of cooling water can be caused. While the present embodiment provides a blower 12 for exchanging heat and cooling the clinker by air cooling. The air passing through the heat exchange tube can cool the clinker, reduce the consumption of cooling water and also can be used as combustion-supporting gas to reduce the energy consumption of the rotary kiln.
Further, in order to improve the heat exchange efficiency between clinker and air, in this embodiment, the horizontal heat exchanger 13 is a rotatable cylindrical structure, and the inner side wall of the cylindrical structure is provided with a spiral blade for uniformly turning over the material. In particular, the horizontal heat exchanger 13 preferably adopts a cylindrical structure with a circular section, and is equipped with a transmission device capable of driving the horizontal heat exchanger to rotate; the inside wall of tubular structure sets up the blade that the heliciform was arranged, makes the material evenly overturn, and then makes the more abundant of air and grog contact, improves heat exchange efficiency, accelerates the cooling rate of grog simultaneously.
The horizontal heat exchanger 13 and/or the vertical heat exchanger 14 may be cylindrical structures made of carbon steel, may be box structures or other structures, and may be configured to allow air to directly contact with clinker for heat exchange. In addition, the connection mode and control principle of the cylindrical structure and the transmission device can refer to a cooling cylinder in the prior art.
Optionally, the feed inlet and the air outlet of the heat exchange tube are both arranged at the same end of the vertical section heat exchanger 14, and the discharge outlet and the air inlet of the heat exchange tube are both arranged at the same end of the horizontal section heat exchanger 13. Namely, the horizontal heat exchanger 13 and the vertical heat exchanger 14 adopt a counter-flow heat exchange working mode, so that the heat exchange efficiency of clinker and air is higher.
Optionally, in order to control the flow of the gas conveniently, a high-temperature induced draft fan 16 is arranged in the gas channel of the hot air pipeline 17.
Optionally, a cyclone dust collector 15 is arranged between the heat exchange tube and the high-temperature induced draft fan 16. Specifically, the cyclone dust collector 15 is a dust removing device, which can reduce abrasion of dust to downstream equipment and pollution to the environment, and the specific structure of the cyclone dust collector 15 can refer to the prior art.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The rotary kiln waste heat recovery system provided by the invention is described in detail above. The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (9)
1. The utility model provides a rotary kiln waste heat recovery system which characterized in that includes:
the rotary kiln (3) is provided with a kiln head and a kiln tail, the kiln tail is provided with an air outlet for discharging waste gas, and the kiln head is provided with a clinker outlet and a combustion-supporting gas inlet;
the hot fluid channel of the heat exchanger (8) is communicated with the air outlet of the kiln tail, and the cold fluid outlet of the heat exchanger (8) is provided with a drying air pipeline (7) used for being connected with the air inlet of the drying kiln;
the heat exchange tube is provided with a feed inlet, an air inlet and an air outlet, the feed inlet of the heat exchange tube is in sealing connection with the clinker outlet through a blanking tube, and the air outlet of the heat exchange tube is communicated with the combustion-supporting gas inlet through a hot air pipeline (17);
a heat radiation collecting box (1) wrapping the kiln head is arranged outside the rotary kiln (3), and the heat radiation collecting box (1) is provided with an air outlet; and a cold fluid inlet of the heat exchanger (8) is connected with an air outlet of the heat radiation collecting box (1) through an induced air pipeline (4).
2. The rotary kiln waste heat recovery system according to claim 1, wherein a high temperature dust collector (6) is arranged between the air outlet of the kiln tail and the hot fluid inlet of the heat exchanger (8).
3. The rotary kiln waste heat recovery system according to claim 2, characterized in that the high temperature dust remover (6) is a metal film high temperature dust remover; and/or the heat exchanger (8) is a plate type air preheater.
4. The rotary kiln waste heat recovery system according to claim 1, characterized in that the gas channel of the induced air duct (4) is provided with a first induced draft fan (2); and/or a second induced draft fan (9) and a chimney (10) for discharging gas are sequentially arranged in the gas channel of the hot fluid outlet of the heat exchanger (8).
5. The rotary kiln waste heat recovery system according to any one of claims 1 to 4, wherein the heat exchange tube comprises a horizontal section heat exchanger (13) and a vertical section heat exchanger (14), one end of the vertical section heat exchanger (14) is connected with the kiln head, the other end of the vertical section heat exchanger is connected with the end part of the horizontal section heat exchanger (13), and a blower (12) is arranged at one end of the horizontal section heat exchanger (13) away from the vertical section heat exchanger (14).
6. The rotary kiln waste heat recovery system according to claim 5, wherein the horizontal heat exchanger (13) is a rotatable cylindrical structure, and the inner side wall of the cylindrical structure is provided with spiral blades for uniformly turning materials.
7. The rotary kiln waste heat recovery system according to claim 6, wherein the feed inlet and the air outlet of the heat exchange tube are both arranged at the same end of the vertical section heat exchanger (14), and the discharge outlet and the air inlet of the heat exchange tube are both arranged at the same end of the horizontal section heat exchanger (13).
8. The rotary kiln waste heat recovery system according to claim 5, characterized in that a high temperature induced draft fan (16) is arranged in the gas channel of the hot air pipeline (17).
9. The rotary kiln waste heat recovery system according to claim 8, characterized in that a cyclone dust collector (15) is arranged between the heat exchange tube and the high temperature induced draft fan (16).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811243007.0A CN109099718B (en) | 2018-10-24 | 2018-10-24 | Rotary kiln waste heat recovery system |
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| CN201811243007.0A CN109099718B (en) | 2018-10-24 | 2018-10-24 | Rotary kiln waste heat recovery system |
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| CN109099718A CN109099718A (en) | 2018-12-28 |
| CN109099718B true CN109099718B (en) | 2024-04-12 |
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| CN113237326A (en) * | 2021-04-28 | 2021-08-10 | 安徽省泽乾冶金科技有限公司 | Rotary kiln waste heat utilization device |
| CN113137856B (en) * | 2021-05-12 | 2022-10-28 | 江苏惠然实业有限公司 | A energy-saving drying device of drying kiln for wet ore dehydration |
| CN114231304A (en) * | 2021-12-17 | 2022-03-25 | 厦门大学 | Internal circulation biomass carbonization device |
| CN115406225A (en) * | 2022-07-26 | 2022-11-29 | 广东邦普循环科技有限公司 | Lithium battery rotary kiln with heat recovery mechanism |
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